It’s good to stay on the straight and narrow, and avoid the calamities that can come from doing things that you know will lead to trouble. Here Seuss expands on his previous talk of having brains in your head and feet in your shoes, where he says you can go in any direction you choose. By being smart you’ll take a pass on paths that would have led to a dead end. You’ll opt for better paths, which will lead you to better places more quickly, and if you end up in a jam you’re smart enough to know how to get yourself out of it.